SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0459220fa58735f0b9ab8d9ba3bb2e5ec5ea5bae7fa39557ed27004a8f98efc0' 
  AND token = 'o/xSbOzq+p8wPhV6XIFU51knXYqUL14JSlMNvjfsQzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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