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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1116beeccb5eaea3859905169a6a7409e85786e47a9b8fc59e266983901aa2b7' 
  AND token = 'JzL0Hm36L2jKuqDtbh/9lJo4ZEz+xXjWk7ou4PUOLts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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