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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a801f16366ec65c33938dc4b4a4a5cf87deb08890a30f7cdefed3cdfd04492' 
  AND token = 'd4EAjIZF//ObWlwcN0nk5OZdBTX6eWsMF0OTrqBAR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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