SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f53089bf5873865d10ab7db2f066e49edb9752584e65005802aa9690a7657f' 
  AND token = 'qlcpDMCZzrG0/svewDM12j53+x83rVnG4zqKcG2Gd/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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