SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cf079e5b41c56bb29d36a32936da81a5aa192736ebfeab62f8d0696292e577' 
  AND token = '3w7Pt8E4GOmM/yKJpBAoMoNIOZBRP4ISZqHthH4oTTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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