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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e942407a25586427696341680025c0c7ca5678b0619527d59cc7f8af10ad34' 
  AND token = 'SHCfz528w3Z9AZEwUFZsgcxewwTxhwkuXjlMl6cI9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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