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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a04e1c8cc56fb4e61ef1628edc6ebb0f8972ee26b93d896ffa4b26daf8495f' 
  AND token = 'Vv8K5TSAXsBy9N7K5Zk61QyH4ux/mo7ZdAqa8c/hQ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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