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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31798abba33ebf64f410ce87583e316b32a847fed1d4dc20cf72e12b1ab00e3c' 
  AND token = 'Dj5WjqTZOUrdwetkR7XPd2oQhiCP6soiXb7sZ1JN9PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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