SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c06569495c4e5bd37a41a37b009effdf680a0853469154e9a6f47bcceb5858d' 
  AND token = 'ZIggCjB3J30BGUBmzDqi3EvVu3O3xaAUVVHV6oF+VOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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