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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832f3f84eae0df32b1a5d6cfc27d0c30b6967b1d9dfd8fc2a2cc24888641cbf9' 
  AND token = '7hwZ8p9ZVcaroBQM4Z9pOktNFgZyrKsIAtjIAZQ/hwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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