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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831ccedea7ac30574ee4c4daa5e52988b8332b03d55d78624e48c824cb76f0ba' 
  AND token = 'KLR4TbQHdbfjMlTtIS2rdyvLtYaBeWr8f/2XcXkEbPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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