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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1cc92269ff3d3dfd2d73c71f7909bfb9b4a7d7f8202d12e65192b16a193b8e' 
  AND token = 'fxM8Zp6qgchTpYg2yhs2TRSoA0N/pfZfUzortIVxFf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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