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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b685adb9fca7ad9144fb9474f7814ddd09dc111200286a08d9d588696f493b5' 
  AND token = 'mIFQUuuiCvuTl4xuVU81rJCBTy+YI6HFpnJOWTrVFCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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