SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110b51a67e4e3f632232c59493f8aa4851d0a5fad7b258827c709e32042ec74a' 
  AND token = 'hlFyWMOAkNpeacpa/HGwJSSjxR5oFQaAu8+9Oe2ZJ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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