SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44ae7f3ef8b806a0e82dba190c8955930ae8182fc79251743a18cc15b47166c' 
  AND token = 'VdwDeJW5xLq+xaw+Q5LqhNNX3YdjDNH74SZ+lgnGzsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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