Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606189d105fd98cb79b59cfa65bf24e71574e64f0b3d0990708f0047d492a1e2' 
  AND token = '/dsbp8xRDYSgz9Hz/XwrJvMgYnxRHWj82Punei9heag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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