SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4ed33e431b9203665f6795f54fa87178bf6ad1fd479f33c381aab3d5f592b4' 
  AND token = '+hrPggF107csp5hwPNydzYPMNjPCBRKV08g42D41Rog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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