SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed57ed0f62c6adc5d166b40a097d97455cfb7a4a8cb6a120f5f4b19586631ca' 
  AND token = '7hUgoAx6qh2QhsuyqCpKwKpJV8sgvGkSOlXa9WiTnus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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