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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce81c5ebdefb2a05182c0163c31a76c900b75412bef2bbd694a92ec517e7328' 
  AND token = 'CGGgIF2B/phNwThHmHp2CTWIceq5WC25i6fHgN7KlF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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