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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19429325221ff4c2d3385ed92656ae4d64ddcd3ca66d4949e2608039e8706ebf' 
  AND token = 'KcrX6Jttfev1FsB8VoxyyY8HKtfow7glH7FJzqcS8wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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