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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e9c9ba54ce749f78829e142adc175b394a83f85958c5c938f609ba22861a98' 
  AND token = 'aBbwaQ9T0kCkT2VTa2Y/7QNslFRdOtOGPCtlRMJ5REA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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