SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076813a0a83f68b9b54dc611e99fc2885f8fe7ccd481f6c56dc103920c54ea6e' 
  AND token = 'gFYdZrHjG5tR7wPWd4pv2525CL1K15O4Zqu1/EgxVVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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