SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da66c32d19b1a666a5d7cfb4a21563190b73c8fc08a56a322996418ee997e3f' 
  AND token = 'Bi7Xmn1ljyZkBAsgDLdPFxFYkEQzeCZ4j8IqRntOZJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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