SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d2114ff530849386f54d8ce092606c109004b223a77361bd8881cbc8e132f2' 
  AND token = 'hEAsMGYkATHJBJ3KJEyR3SoK5XALfgJ7XEzjuUl4Z+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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