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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df87af5280f5834f141479e2cbf8e867afd0d4118b305401404d881929c8350' 
  AND token = 'qYHh1xgweeh2MjVInyRrqNe2FRYtIQNt3faOM7TYx/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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