SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b14700b8663ad31c7153efce849b370e58f7f6745a0ce45221afc8952b3aa2e' 
  AND token = 'QsZ7RqOqKTCKp0BMC8hgpK9gKYV/tIpksTlTnRkjn1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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