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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716ae408887c0b87f56e084cb19b6784a339b0c6ace6806ea1b7206fcf1bafbc' 
  AND token = 'LhMGbNORl6P2ZV885W079D9ZRqjj5GWFMd8buHlCgx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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