Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87db6a0ee20e103c130260a7290ece134cd5bc25c4bbe181f131ef8edab13543' 
  AND token = 'pgb363u2qqhX52y9LbpUIl1ju6OTlQRgcFBYSUoS05U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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