SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5236c0bedbdde3793ff46d5ae191a31e09cc53726e94b4fceddf8e08c641b0a1' 
  AND token = 'iDxPYgGSpBKwe4Cy3K2tHUtbqgRZKVuM2MjQjMN0xJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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