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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b736f52c48730e9d3d4246942676cf9da59274118e3e1913b02660012395ee' 
  AND token = 'vvIg88gq1fPyWIkOsZ+wecW9WvP7qL3XkkHlcPYcOZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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