SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200987e7e6c8cf072761245b66be0dbe5d69570d24715d11af1b43272ef281c2' 
  AND token = 'K3O284B4yRqk6yAJyXbvzlS6SY2I1h+P3FwKjvovi/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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