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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ee1b4459d91fbbced7ccbd94d976b84b8885b8114e9cdabc1eef6f795c7ca8' 
  AND token = 'Kv5dSid9f7F0RURKXgeYHsOq195/dgUmfzl9WsdjvhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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