SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9d644b0a69ede6aed21c0c0bb5bf47f66bde09e7b9f19797dc5bf8d4a1ef9e' 
  AND token = 'n+igvVvwX6jfJNTsFqJB0V4BNFeZOYrTRo1hU2zHHlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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