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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9e1dc34f777686e785109d700a0267c824ca97341b2ab3bbb2e8f11e88f843' 
  AND token = 'vWSfOm8ew9YtA7arXTYj6e8LvaTsmQtmVLhQ3XSTEqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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