SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037e997c29f9659871f8a2db57516702bd7029adc218ba38a4b9545aa0c5bd0d' 
  AND token = 'oWwjBq1EA94tgHMYnmqOHonrWhLEbDcJqVkvSOKLpNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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