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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd7d130f9c58d37ef78707f04603f6ac2dd413b989070c59685fa19cba33956' 
  AND token = 'aA4cBcLnNVZbho4UWIvUwX3hCMwmotVev2PXsDLUh+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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