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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c691e5732ee2f2cd7fa19af687ac8aa9b5861561ff28c3cf8f3013ca5228cb' 
  AND token = 'N9rT8x12IAlQJXRu7Wgpofvnp0gmMZnsFqvinYX/4sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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