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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8e252c1c0956bdcca7bfea489088a65020968fb91b756b49558eb545eb5d3a' 
  AND token = '7Las/XKs7m+5a3qMaX0KpV0BT3/so5vdQaFr2o8OPaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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