SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4730abd2530be612d9d691216f58240cc7bd6c5ab9a6c84f2a15c2eba73d2b24' 
  AND token = 'WZKAFXpNxBKbFfOHj8UV8rGHlY17mglWMUxEz3NbIfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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