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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3494ea1e6d43a54ec9fa5a80396aacf5a321ba0420b49555ba4075372a6707' 
  AND token = 'iOjhSki17DNuL6ZzuBk6BCFO2JQxGZeA7K+dr4+Mnho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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