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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937c3c7ef75e213fb513eda8b46d7254d6a5709f37a0c8adfede180a876ed26d' 
  AND token = 'ziyzet0T5FlovbleRYH7JJfvJZAtYo6PS2+5FZ8FrMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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