SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33c239c1d2ed5cbd1ad5d206897161de15cabded2eb5deb282100df93cf4664' 
  AND token = 'SOU1g+LqK8SOCq0BomWWIQyFIfjgi06EEPS2eqMD4p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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