SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a3a8f0f4d2a6c5d9801f6563b76d5790bf5cb40d5bb8bbd932edb179a3b987' 
  AND token = 'rDRZBCh6SD+hhODcqGwo41g9OPfBi9T6P/hoVj6rOYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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