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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2b8dc861b2e50b2e33a2004eb4c5d3faeddb15e55b4cad59a68dbfdcfd7635' 
  AND token = 'mcTiJ7sZTWHzNQqZQTYL9yOlUdgy3Vi3XsvXaJSauBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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