SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac6eef0dfb6e2e1abc6179c43ca77f00fa035d1a4c042842c0615c037471b01' 
  AND token = '+wBK5Tqb/n9V6rhCh/rDozJrYDOeJjh3UTQCkJxhGOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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