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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a11f8b958e3c7e4499b8e14fa199acbd3ad0b18a4ea97f84ab47a29df84c43' 
  AND token = 'lpIu3qxq30jDX//984maJevVaFxWcIfN3U8byXwLcfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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