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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d1d30409295dbe63e1b6697a5e8c4a84eb4b791f8ecbdad1e49a53a96caa13' 
  AND token = 'pQh4tlMhGKfGvf0BN+viHAbure82XF5YnNsZ6pYnZEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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