SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aed085ce97a694fe83e9ca4b83c72357f418b00e8ccc5d34512df1bc4626ac' 
  AND token = 'ZTVpjqbTa+7iL1VrsPOSdwi6sQ5Ywuw9/ZKbZ4oOgKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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