SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba7dc36c84f6bb954361cd9a3f065017252087ca0021de6db3057f33b23dfc4' 
  AND token = 'pmzBjxGZrP7L3FXNgfUbnBd0LDC4dqckvg/FIimjLWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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