SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c8a7e9e3a9505f9f4b4979b226d948fcb2c4dacd57942fed80a21d2d19366e' 
  AND token = 'xp50sNIvF5hNj5GZWTkuQFVj0NAnB8YlBOrwv5zmVcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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