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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5b876337ec7bc36c0078ee4191ad8d04eab7884c1417c9640537abe7589171' 
  AND token = 'QT5gxGkvJZ92la7CRU3ogtCUCHJW6WYK1ROgwVua7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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