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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a912fa2e7e8f48475b9e6420328047fa2e320cc7115a363e6fd3d124935b4173' 
  AND token = 'aNSx1+qY166WlIgfh4Zupi/1gi+s+vNLOnu0o3tmRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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