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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7c0738882d47f5d3aade717e99bce5a87e7b958a8c4d0d6590f57ca5697cd3' 
  AND token = 'H5joS+lHy7lG+YPjUl4ZBokjyi2oU9TCJ8ej3f5igOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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