SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ab91045676bd82af3ee03f6652c7fcdaa4d32db35c70575c31447e082e584e' 
  AND token = 'VdsvcBXvCzTOJas3BXiMeqyJx8gbh5Zes9zsAVqIanM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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