SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c7e0f847bf945fa1e1ad2c74e8f5fb34a9f8652b97027880b846e30109bf85' 
  AND token = 'LzXQd3bGJiqGXVw6DtZw/hcJ+Q7/CGhheKQ1ElgJhM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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