Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1ba85ccacf62aa33128065b1621ac71f1a67f8cecec82132e1877427714133' 
  AND token = 'izYzAcCcrwqdwyqM7NBolzHrKG1P+XuG4aflWxkuMro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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