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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8b18250f00d529e93b5ebdd40caa7da3b8cf6a242d342e1e39ccde048e05fc' 
  AND token = 'ZytcWHyQs/oAY36fPQxGzddUwmX4/ypv/pLMiH0m6HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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