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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea2dc328a848d463fb016e11c8602d8d9c2e9b31d5973bdceb5c2511d117f41' 
  AND token = '9phX9zkd+GjLlD+qWPN895vab1kpny1iMii7D3WF1Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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