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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ff90bd439d87e7a74f3fb77ccc6dc43236a5f628f51fc91b74d1bbd24f7d52' 
  AND token = '/2NQ5XFlD8QOK9rN3l01vCHuG4aywsng6asrsc16PZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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