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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdf973627b8112b958e468034b85ebe4d23aa748c205e6e4e6d57d043ba908f' 
  AND token = 'J67aEvrROpLMTl7aFraxUuSvWo9K7T/bcC6uX/XlX0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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