SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880f5f153f780e6124c97a7e6d2369db843aa1295a25c2b02c26a8da043ca00c' 
  AND token = 'I8p/wmlewGBuh008qvV4j6eK+B56hOJuz0mvzStY3e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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