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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df4d24c3736d75d90d0ca0610cc00fced81dc48771e16eb868b62730e94d868' 
  AND token = '6TcnNC6XjIAmQmUyPmuoRSBU+N6PiuWdv8A5MCjR9Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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