SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24b1b546cc3db6b271e42202c9ad463cf08695a152086dbbc654e0831614063' 
  AND token = 'gJjEYuF4P6GTqU3KMBKRph3fghQVB7F0trIEHQV/IPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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