SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67806188a0363c7c0a9bee674f49d30cd7971a32a93998618626b8d79e1754b' 
  AND token = '0ZKOVntGywIcCNEuFlkFMZHuK6YJPLfOZIhTmXY+2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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