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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea53227dc15488fc189e63b9c00bcc1833fa76146268a0ee09924ef87b4fc75a' 
  AND token = 'EKdq8iwtViMgfrc+AzLeu7ftN4GUmEsv9MlaxsBmt50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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