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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e20f0014354c28fb459ae832d78e671565a8353fea88b89953169376124e9d' 
  AND token = 'qnvdfp7cqTP2P0EOTfbtpnaR9AlqRz/Vs+ZnyvV9yJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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