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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3446779e644a40b7d952472944db592d4f80db459db0f82ef6cbbc48d886104' 
  AND token = 'vgbrSSqrPeXsEaeXUdE+vQKCBHU3oe/6IaVPNgQ5TrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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