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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409169963b4a0c5b9bd46d32993bcae12ac7e41dd7b5d12639ee3a7bd1f41f47' 
  AND token = 'wCFlD9zKy0XHjUqQ0/9Ni7q9u4sxnIJdoHHWsGlwL4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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