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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f6844f8227106df21396712b5319b30fc32b525c9a8cab82bafd089020f8fa' 
  AND token = '4oemT2xePRW3s+A5iKCDU/nMsow9y7gJ3Q7iSJFgIWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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