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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a35a8c43ceb9f0f22169e3c690c14ac2180238295ebbc4e263a1b3688f45a0f' 
  AND token = 'VjXqdA3T95JdhL8W90gCm14eq+70faPUpnOPaCqeTlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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