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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca463a4b3d7f3a02c347520675c9d974052b77518f1d16685e8e88a25b0d6bd' 
  AND token = 'oemJmiQfFt+bsl+Xd5XEK/AYVw5oKb2CtVI12XvgM20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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