SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19387a0e77eb652d213075a0c03d8056c83968f336249d0df92645545365de08' 
  AND token = 'HUYfGwRFFE/X2lMqljsgY82zkBUBGARzojznY7U4ggQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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