SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f04add590c7facfcfbe4c8a1e7cc9404bdc0dd53cef460ed5718293b91a1ca5' 
  AND token = 'ml4SHZBIBgpLv+vhrs+JASG367QE8VUxHlr9DlT/TqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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