SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67be2161899d59430228f341a36bffeae86d47e257fbfa8614de426e93b1249e' 
  AND token = 'KpDMXFYu+PGvwB6K61RbNJbzV9b4Gy+gKTT0SacMWwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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