SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1ed07c11f5adde8fb5e86871d705787918c8a2b791f38533e6e0b92374212b' 
  AND token = '0BGpC+wlw43XDfnDZGQAbjqtbB++6Il44RRnq/yIUPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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