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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc510b23f3765dd52c1731a101a5e97b3a8cdb6c9f172b8e5fe6cdcba520198f' 
  AND token = 'LmxcAAa2Wvwn7A45fko6j4PHPrBYDnAelbtvNNur+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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