SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeedef31470d9264e3cf00f03d3f9c8d5267856bf891d3067943ed1f34fa61aa' 
  AND token = 'kmfsuD15uzOxbVohZK/bBJk2/BO8v19zsOzas0jlFTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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