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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e87f73edaa66b6c17d47c22a67e3b79fd1f3f36b86822bd9b81be569dcd3fc' 
  AND token = 'tYxE5LvzN63XX9mTSkm/khyEQCkHhhCspOuIIIu2Ufc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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