SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d3bf50166e5412d57553c0e36785cb29f1a8b8fe98d067a2b774dd4b26f68e' 
  AND token = 'paE+BgSlPGpHORgYz2QTii2cr+hIapNCPr0/V33vicE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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