SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67328481a63f4f8a14037124293519db73a341585ce4939cfd05597748dd72b' 
  AND token = 'auNMYKCpoavv5T9xJvj5N1UApOqyX8+FwUHrbzz/LyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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