SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a5e6239f06f90f206c741289499491896a5443c052deb0b3b2c0fb08d69862' 
  AND token = '/VX+fN2hhn0ceUkrmvCOw7uyhJ+OZY1Wjv8fo4rUwIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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