SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3bbfef4be6a18e14347295428853fd8edd96c9dbd27cd662f2934127d7e81a' 
  AND token = '1S83B9xKjZg0vOxXvZP6LRgNrT20J6VVghJXkzKTzxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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