SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b4836116c23e9ed3dfb8e075edb7ba72611905fa98e5ca48b6b0677fbb534f' 
  AND token = 'SLFfgWZv63iOOQ8s6Jxps3HuQkj1Y+e5kqNKTlpLC/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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