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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329129abdeb6cee6d58e3d07a34b39062de40e2b390315fd4818de84e5112398' 
  AND token = 'VtfAzO9NtdrYhhXUgVXibut6AgxxgbTY20Ady8RSf3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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