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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f7e60a4a6f113d0a9de8f14ab8a89d41b72b6de7d2f90eb6aa2dd54436b06c' 
  AND token = 'yNZGc2CH8mGA3jSCcOvI3RiClhrONR8BmbaABIfvKj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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