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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360bc1895d3738e8f429457c8953896d09543ed97682231937de9fa3ff250a4b' 
  AND token = 'S6KIyt20sh3gyi4bJOJk2LJaF8laKTkZ8qMW/Fj+tgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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