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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763bb5e2e09f6b8f8895593404a38173b279339fcdc5a33a810b5eb61465445c' 
  AND token = '+3V/TVFgCWS+dAV/+G0Gsf4RNEa4v0EYT/pM6HcK7/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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