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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea7b79b3018bb55244d59be7af17744e9732bba9f6e9af1cf14c4cbbd78ccc0' 
  AND token = 'ZDSqxBuMaQu0kD6R/xn05/7m8bhRfPvWJqrvz6+PKkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}