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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9289918afca9ab5c07ed199166679aa85ad0144c6028421c279399bd5393777e' 
  AND token = 'mHAdHVS58kmrkkSX2EMGr6TQiRGknadOtp0kOyfB0R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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