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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4e6ed6f7e74dfb7cf24fb318a3abfb17bad5911a35a704ad543846fb2dd31b' 
  AND token = 'AKzkxwaiw6bwqNoQV7Z0KeWWE5pEs0C7K8Bji2BRy1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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