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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dd76ea105bd11439ca12e2a6a74849ce32069607d5926c8c690fdf9abbe1df' 
  AND token = 'uE02LARa5PbkN0Thr8rESfP4WCNLJfHOAfHkef68zfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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