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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269d0a18609feaabe2c689b85307a78734a680da0c598d6d8da6c152b1d44d51' 
  AND token = 'A8tSgbzc0tWHeVxIDBKkCrvTKn5iGHCOMdBLcczD/iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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