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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f063917623602a0df2dedee950d030583b121cccb44916648378eabd27956d9f' 
  AND token = '7GgBag29QhBY/rkOLfgJkJhV7lxyFyaV5s5mOmoem/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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