SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e925dd6d67dee93b615a934ef34a1620d6cf3c872994f317fd06de39f3619c6' 
  AND token = 'KfZHcPRmfMQbVwW2v2JEGUcQOYjzeHl5Ay7gh+LBAgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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