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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eca0cb6734918b290c0df5ded061a731e15e2702d05aebbb615ee271cc7678' 
  AND token = 'c2VTHnL7YRSjaK5/QyNXY+9/nAgKnhAm+H/BZBZC7LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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