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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fff215dcafed8d70dca65d87dc8d9571fcef0dc4992137dc10b89395a2f812' 
  AND token = 'QCAzW/OPmaQ1yNyXZkwFuuThvLfHirkewmOnVXFzrFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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