SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fe9348239b3b9f0b14cafca8fd7827a2dcf774a0bf3403dc80245b1f634936' 
  AND token = '3Cwg1QBcidm5vWd5CkSwngh6ujYVpbXl5MIAwBqGiuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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