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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb79b5b933d3d97a6cf92c16c387706fd8a4fe9e89c31f44e4b52a0a1ca34fd9' 
  AND token = 'ZvDgPMnzRlBZ16Tf9TsZ85uSaQSAsJifgnGI5VM5M5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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