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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66e7f280452ad9ece4e62e68ec1718182f82096d3e7a08eb61615ae5a43e9b8' 
  AND token = 'HM7pykG0ycnroyu2PoNyI/UeWTHjh6XWwtD93F60P8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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