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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f227cc95fd6bd777cca4dc2dee8f24cd21d6e2c7ce6d408b35e3f03954d6d52' 
  AND token = 'dmsLMHdnEKrDQJaj8sSh4AHi9eBuGOyPtZpHQwxDanU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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