SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34eaf0d13999ea34621f26d5244b4e59a8e35868612295a7343ba5d7a5525169' 
  AND token = 'xtfxOCXFQoX/pNTM/vUjUhZIxrBG++Lg/xmL2J1YozY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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