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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa117b2ace51493efdcfbd1940757e435e90dd2734482250b01599fe365f9da8' 
  AND token = '0Wl2EGIxxzPam6cOBXo4bHfH+NT98uahU+A86sqs9/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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