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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17757da0626a48ef629c7b1e4e2fe7e6099427712074d0f35df62d3d03a9c068' 
  AND token = '6JmXWy8r/c+XH3ebwyNQo6qZc/ouO8K5h9x91Y0uJzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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