SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c807c396af15d3be9dec8b85a2476b4312819ed4565a3a6c03b184fdd12290' 
  AND token = 'N/+lZp8wJQnzuN08eCuubHRKCPwoXdi0G+WdKgl3R50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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